The RepositoryService maps XML attributes from configuration files (or properties from programmatic configuration) by using reflection to determine the correct setter for the property on the corresponding RepositorySource (e.g., FileSystemSource) and invoking that setter.

However, if the RepositorySource has overloaded that method (e.g., FileSystemSource#setFilenameFilter), the RepositoryService will only test one of the overloaded methods and, if the RepositoryService gets the wrong method, it will silently ignore the setting.